Could this fault be wiring loom rather than Injectors ?
Discussion
Hi All,
My first post here so go easy with me.
I have a 2006 Audi A6 2.7TDi it has done about 57000 miles full service with recommended oils etc...
A couple of weeks ago the car developed a knocking noise, this was diagnosed by my local audi garage as an injector fault.
They wanted me to change all 6 which at 2500 quid fitted I gracefully declined saying for them to dianose which one/s weren't working.
They came back a couple of days later saying injectors 1 & 3 so they changed them and gave me the car back. Car is just out of warranty so it cost me 860 including vat.
less than 400 miles later the noise is back.
I am worried I will be palmed off with "it is different injectors this time"
There seems to be very little actual manual diagnostics on modern cars if the computer says what it is then it is that end of...
anyone got any ideas? is there anything else I can do?
It seems that even if I use my own mechanic he'll need to go to Audi to initialise the injetors...
Many thanks
Steve
My first post here so go easy with me.
I have a 2006 Audi A6 2.7TDi it has done about 57000 miles full service with recommended oils etc...
A couple of weeks ago the car developed a knocking noise, this was diagnosed by my local audi garage as an injector fault.
They wanted me to change all 6 which at 2500 quid fitted I gracefully declined saying for them to dianose which one/s weren't working.
They came back a couple of days later saying injectors 1 & 3 so they changed them and gave me the car back. Car is just out of warranty so it cost me 860 including vat.
less than 400 miles later the noise is back.
I am worried I will be palmed off with "it is different injectors this time"
There seems to be very little actual manual diagnostics on modern cars if the computer says what it is then it is that end of...
anyone got any ideas? is there anything else I can do?
It seems that even if I use my own mechanic he'll need to go to Audi to initialise the injetors...
Many thanks
Steve
i can totally see where you are coming from and unfortunately you are right that more and more mechanics rely on what a computer says rather than using their own brain to fault find.
There was a problem with the TDI looms, TameTechnician on here provided some good information about it. You should be able to test the injector loom with a multi metre to check the consistency of the wires/connections. One theory is that becuase part of the loom runs beneith the inlet system it is exposed to a lot of heat which can be a potential problem.
have you still got the original injectors - you ought to be able to get them sonic tested to see what the flow is like an if they are working correctly.
Where abouts are you based - are there any independent Audi specialists near by you could get a second view from as i wouldnt go buying anymore new parts just yet!
dave
There was a problem with the TDI looms, TameTechnician on here provided some good information about it. You should be able to test the injector loom with a multi metre to check the consistency of the wires/connections. One theory is that becuase part of the loom runs beneith the inlet system it is exposed to a lot of heat which can be a potential problem.
have you still got the original injectors - you ought to be able to get them sonic tested to see what the flow is like an if they are working correctly.
Where abouts are you based - are there any independent Audi specialists near by you could get a second view from as i wouldnt go buying anymore new parts just yet!
dave
Hi Dave,
I saw some posts from Tame technician.
I know of a guy in Surrey in a business called AMDteknik, I have spoken to him but he thinks it is a bit far to drive it on 4 cylinders.
unfortunately the vast majority of places here are main dealers rather than tuners.
I'll have a look into the loom diagnistics I am an electrical engineer by trade so as long as I can find the right cables to check the rest should be plain sailing.
Thanks for your quick reply.
/Steve
I saw some posts from Tame technician.
I know of a guy in Surrey in a business called AMDteknik, I have spoken to him but he thinks it is a bit far to drive it on 4 cylinders.
unfortunately the vast majority of places here are main dealers rather than tuners.
I'll have a look into the loom diagnistics I am an electrical engineer by trade so as long as I can find the right cables to check the rest should be plain sailing.
Thanks for your quick reply.
/Steve
If its the 2.7/3.0 injector fault that we are aware of "there is a TPL for" (i've not heard it described as knocking before, rough idle and smoke is the normal description) then its not wiring its the injector.
They are tested electronically, live data about the injector operating time is read while the engine runs, a spec is given and if an injector is out of said spec it is faulty. You are supposed to replace all of them if one or two fail to avoid repeat repair. Hence you are now having a repeat repair.
If you feel they are fobby you off and telling you its different injectors when it isnr, demand to see the printout of the data from the car which will say, which ones are out of spec.
Thread on it here
http://www.pistonheads.com/gassing/topic.asp?h=0&a...
They are tested electronically, live data about the injector operating time is read while the engine runs, a spec is given and if an injector is out of said spec it is faulty. You are supposed to replace all of them if one or two fail to avoid repeat repair. Hence you are now having a repeat repair.
If you feel they are fobby you off and telling you its different injectors when it isnr, demand to see the printout of the data from the car which will say, which ones are out of spec.
Thread on it here
http://www.pistonheads.com/gassing/topic.asp?h=0&a...
Edited by Tame Technician on Tuesday 16th February 19:38
Thanks Tame Technician,
This is the first car I have ever known about that you change all of the injectors if one goes faulty.
but you live and learn... I can't afford to repair it, 1/4 of the cars value on injectors is ridiculous.
800 quid for the initial repair was bad enough.
What are the odds on reconditioning them? clean/flowtest etc..
The other thing is they specifically tested all 6 using their diagnostic tools, It seems a bit wierd that a the same fault would appear only 350 miles after they changed the ones that came up as faulty.
I am sure they are an honest dealership and they have the bet customer care I have experienced, but £2500 for six injectors is too rich for my tastes, I'll have to take my chances and trade it in on something... I have to have a reliable car I have a 75 mile a day round trip to work, looks like I'll be in a shed soon then :-(
oh and by the way there is no smoke that I have noticed, idle is a smooth as a babys bum, 1500 rpm and up there is a slight misfire but not really bad, so I assume it is a srewed up pattern/over fuelling rather than totally dead cylinders. the noise sounds like diesels used to sound, sort of halfway between shot big ends and rattly tappets.
thanks for your help.
Steve
This is the first car I have ever known about that you change all of the injectors if one goes faulty.
but you live and learn... I can't afford to repair it, 1/4 of the cars value on injectors is ridiculous.
800 quid for the initial repair was bad enough.
What are the odds on reconditioning them? clean/flowtest etc..
The other thing is they specifically tested all 6 using their diagnostic tools, It seems a bit wierd that a the same fault would appear only 350 miles after they changed the ones that came up as faulty.
I am sure they are an honest dealership and they have the bet customer care I have experienced, but £2500 for six injectors is too rich for my tastes, I'll have to take my chances and trade it in on something... I have to have a reliable car I have a 75 mile a day round trip to work, looks like I'll be in a shed soon then :-(
oh and by the way there is no smoke that I have noticed, idle is a smooth as a babys bum, 1500 rpm and up there is a slight misfire but not really bad, so I assume it is a srewed up pattern/over fuelling rather than totally dead cylinders. the noise sounds like diesels used to sound, sort of halfway between shot big ends and rattly tappets.
thanks for your help.
Steve
Edited by worthingsteve on Tuesday 16th February 20:02
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